lcd_log.c for SD

[jspika]

Posted on February 19, 2014 at 22:33

Hello,

 i saw this library at USB-host example. I decided to try use this library not with USB but with SD card. I am trying to get understand how this library works, but it doesnt seems to be so easy. I have problem with

understanding

of LCD_LOG_Exported_Macros. for example : #define  LCD_UsrLog(...)    LCD_LineColor = LCD_LOG_DEFAULT_COLOR;\                                             printf(__VA_ARGS__);\ In main program i use: LCD_UsrLog(''> Hello.\n''); LCD_UsrLog(''> Hi.\n''); Both texts are written on LCD 2nd one under the 1st one. I have no clue, what part of code does that? Does any1 has an experience with this library? Can some1 please explain me, how does it works? Thanks a lot, Jan

[Tesla DeLorean]

Posted on February 19, 2014 at 22:57

The STDIO character output stream is captured and directed to the LCD

PUTCHAR_PROTOTYPE How exactly this integrates depends on the compiler/tool-chain used.

[jspika]

Posted on February 19, 2014 at 23:43

Thx for answer, now I see the connection between

__VA_ARGS__

macros and PUTCHAR_PROTOTYPE